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Certainly the EU. https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=celex%3A...:

”8. Natural and artificial room lighting

8.1. Workplaces must as far as possible receive sufficient natural light and be equipped with artificial lighting adequate for the protection of workers' safety and health.

[…]

10. Windows and skylights

10.1. It must be possible for workers to open, close, adjust or secure windows, skylights and ventilators in a safe manner. When open, they must not be positioned so as to constitute a hazard to workers.”

Effective since December 31, 1992 (two years later for Greece)

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"as far as possible"...

I wonder how that is interpreted? Does that exclude buildings older than the code? Does it prevent new buildings from being constructed without these features? It would always be "possible" if enough money was spent on it (and you ignore other considerations, like historical values)...

> I wonder how that is interpreted?

* If the nature of what goes on inside a room conflicts with the presence of windows -- e.g. labs (say, a laser lab)

* if the room isn't meant to be used by humans (e.g. storage closets, server rooms) -- If humans sometimes enter such rooms that's OK, but it can't be their "assigned workplace".

It’s the EU, so you can count on it being reasonable.

The example I know of where it isn’t enforced is of people working inside a refrigerator. I can imagine security conscious jobs and radiology departments also may be exceptions.

It also doesn’t mean all rooms need windows or even natural light. Toilet rooms often don’t, for example, and storage rooms often only have windows high in the walls or in the ceiling (typically way more than in “a room with a view” in Cupertino :-) )

It essentially means that you have to have a real reason not to have windows, not just "it was slightly cheaper". So new buildings would get them, intentionally windowless spaces (darkrooms, freezers) are allowed for a purpose, and adapted historical buildings are allowed.

It definitely does not apply to restaurant kitchens. For older buildings not at all -- plenty of totally windowless and even basement kitchens -- and even for newer buildings I think "serving station open to the restaurant floor" counts as "natural light" (and actually isn't all that bad).

Where I just had lunch they get natural light whenever a waiter opens the door to bring some food out.

Source: I live in the EU and have been inside a lot of restaurant kitchens in both Germany and Hungary.

It makes sense considering the lesser sunlight hours certain countries receive (especially parts of UK, Iceland, Germany, Scandinavia): https://commons.wikimedia.org/wiki/File:Europe_sunshine_hour...

Sunlight is not only good for morale, but also good for health.

The direct physiological benefits are blocked by glass, which is naturally UV opaque, fwiw.

There is some physiological benefit just from the eyes being exposed to very bright and/or blue light at the right times, too.

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